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The declination at a place is 20^@ west....

The declination at a place is `20^@` west. In what direction should a ship be steered so that it reaches geographic north east?

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The correct Answer is:
`65^@` east of magnetic north
As is clear from figure. `N_mS_m` is `20^@` west of `N_gS_g`. To reach geographic NE, the ship must be streered at `(20^@+45^@)=65^@` east of magnetic north.
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PRADEEP-MAGNETIC EFFECT OF CURRENT AND MAGNETISM-Exercise
  1. A magnetic needle free to rotate in a vertical plane parallel to magne...

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  2. A ship is sailing due west according to Mariner's compass. If the decl...

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  3. The declination at a place is 20^@ west. In what direction should a sh...

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  4. The true dip at a place is 30^@. In what plane is the dip apparently 6...

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  5. The true value of dip at a place is 45^@. If the vertical plane carryi...

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  6. If theta1 and theta2 be the apparent angles of dip observed in two ver...

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  7. A magnetic needle is free to rotate in a vertical plane which makes an...

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  8. At 45^@ to magnetic meridian, the apparent dip is 30^@. What is the tr...

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  9. A ship sails due east according to compass. If declination at that pla...

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  10. A bar magnet of length 10cm is placed in the magnetic meridian with it...

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  11. A very short bar magnet has magnetic moment 1*4175JT^-1. It is placed ...

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  12. A bar magnet 30cm long is placed in magnetic meridian with its north p...

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  13. A short bar magnet of magnetic moment 0*5JT^-1 is placed with its magn...

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  14. A neutral point is found on the axis of a bar magnet at a distance of ...

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  15. The magnetic needle of a tangent galvanometer is deflected at an angle...

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  16. Two tangent galvanometers, A and B have their number of turns in the r...

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  17. Two tangent galvanometers differ only in the matter of number of turns...

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  18. Two tangent galvanometers have coils of the same radii, differing only...

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  19. A 2 turn coil of radius 10cm is placed with its plane in magnetic meri...

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  20. A compass needle whose magnetic moment is 60Am^2 pointing geograhic no...

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